Keystones — Capstone
Five GCSE retrieval questions · 3 August 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 64°
Answer: 202.2cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 53, 56, 18, 65, 36, 46
Answer: Mean = 41, Median = 46, Range = 52